Influence of Oil Flow Under the Flexible Sleeve of the Active Bearing on the Stability of the Rotor Bearing System

摘要

This paper presents results of the research towards the development of oil bearing for the active and passive control of vibrations of rotating machinery. The bearing is furnished with a flexible sleeve whose deformation can be controlled by oil pressure in the chamber that is located underneath the sleeve. To optimize the flexible sleeve as well as the chamber parameters, both the nonlinear and linearized mathematical model of a simple rotor system comprising the active bearing were developed. The dynamic properties of the flexible sleeve and the rotor were modeled by means of the FEM whereas the Reynolds equation was used to approximate the pressure distribution above and under the flexible sleeve. These mathematical models were used for analysis of the influence of the flexible sleeves and its chamber design parameters on stability of the rotor system. Results of the numerical simulation of motion of the rotor system show that by a proper choice of the design parameters it is possible to increase the stable region of the angular velocity of the rotor system.